Set branchPatterns to null to hide

[ebrelsford]

Description

This PR updates the gh-pages config to hide branch patterns.

Closes #229

QA steps

• cp public/config/gh-pages.js public/config/local.js
• load maperture
• in dropdown, "styles on a branch" should no longer be present.

Author checklist

Create the PR

• Fill out PR template
• Make sure you've added a CHANGELOG entry under "Unreleased"
• Request a review
• Make any requested changes and get approval

After approval

• Merge any changes from main into your branch, resolve any conflicts
• Squash & merge changes into main
• Delete branch

[almccon]

That works, thanks!

[almccon]

I also added a similar line to local.example.js too.